[英]Grouping array items based on string value
我正在尝试按sport
对数组进行分组。 可能是n
个运动。 最后,然后使用它创建一个新数组。 是否有一种有效的方法而不会过度杀伤力?
$sports = [
['sport' => 'soccer', 'id' => 97487];
['sport' => 'soccer', 'id' => 244800];
['sport' => 'soccer', 'id' => 258740];
['sport' => 'basketball', 'id' => 147884];
['sport' => 'baseball', 'id' => 222240];
['sport' => 'baseball', 'id' => 222245];
];
初始数组:
array(6) {
[0]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(97487)
}
[1]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(244800)
}
[2]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(258740)
}
[3]=>
array(2) {
["sport"]=>
string(10) "basketball"
["id"]=>
int(147884)
}
[4]=>
array(2) {
["sport"]=>
string(8) "baseball"
["id"]=>
int(222240)
}
[5]=>
array(2) {
["sport"]=>
string(8) "baseball"
["id"]=>
int(222245)
}
}
所需结果:
array(3)
{
[0]=>
array(3) {
[0]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(97487)
}
[1]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(244800)
}
[2]=>
array(2) {
["sport"]=>
string(6) "soccer"
["id"]=>
int(258740)
}
}
[1]=>
array(1) {
[0]=>
array(2) {
["sport"]=>
string(10) "basketball"
["id"]=>
int(147884)
}
}
[2]=>
array(2) {
[0]=>
array(2) {
["sport"]=>
string(8) "baseball"
["id"]=>
int(222240)
}
[1]=>
array(2) {
["sport"]=>
string(8) "baseball"
["id"]=>
int(222245)
}
}
}
您可以像这样对数组进行分组:
$sports = [
['sport' => 'soccer', 'id' => 97487],
['sport' => 'soccer', 'id' => 244800],
['sport' => 'soccer', 'id' => 258740],
['sport' => 'basketball', 'id' => 147884],
['sport' => 'baseball', 'id' => 222240],
['sport' => 'baseball', 'id' => 222245]
];
// we will build an array here where the key is the sport
// name and the value is an array of objects pertaining
// to that sport i.e. 'basketball' => [bb1, bb2, ...]
$array = array();
// now consider every sport object in your original array
foreach($sports as $key => $item)
{
if (array_key_exists($item['sport'], $array)) {
// we encountered this same sport in the past so we
// know $array['sportName'] already exists and can
// push right to it
$array[$item['sport']][] = $item;
} else {
// we have never seen this sport before and now must
// insert the sport into $array['sportName'] = []
// and push this sport object to it
$array[$item['sport']] = [$item];
}
}
// since $array's keys are the names of the sports themselves, but
// you want the keys to be numeric, this will build a new array
// from just the values of $array which at this point contains
// grouped arrays of sport objects
$result = array_values($array);
// print the results for good measure :)
print_r($result);
这可以通过循环运动数组并构建第二个[sportName => arrayOfThatSport]
数组来[sportName => arrayOfThatSport]
。 在for循环中,我们正在检查给定运动是否已存在于此数组中。 如果可以,那么很好,将该运动添加到该运动的相应数组中。 否则,请通过$array['sportName'] = [sportObject]
为该运动创建一个新数组。 如果考虑循环的几次迭代,您会发现我们要么总是添加到现有的$array['sportName']
数组中,要么每遇到一个从未有过的新运动,就在这个位置创建一个新数组。 这为我们提供了一个类似于以下的最终数组: [ "sport : [...], "sport2": [...] ]
但在您的情况下,您需要一个数字数组而不是一个关联数组,因此需要调用array_values
。
这是我建议的解决方案。
$groupedSports = [];
foreach ($sports as $item) {
if (empty($groupedSports[$item['sport']])) {
$groupedSports[$item['sport']] = [];
}
$groupedSports[$item['sport']][] = $item;
}
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